Device for starting gas turbine motor plants



Dec. 19, 1944. E n 2,365,551

DEVICE FOR STARTING GAS TURBINE MOTOR PLANTS Filed Jan. 26. 1942 Patented Dec. 19, 1944 DEVICE FOR STARTING GAS TURBINE MOTOR PLANTS Louis Armand Hermitte, La Coui'neuve, France; vested in the Alien Property Custodian Application lianuary 26,1942, Serial No. 428,305 In France March 1, 1941 2 Claims. (01. 230-45) This invention relates to a compressor device which is intended moreparticularly for use with motor turbines, and its novelty resides in the means provided for starting the operation of the device. According to the invention, the power necessary for starting is supplied in the form of pneumatic energy which may be furnished by an auxiliary fan driven by any suitable source of power.

1n the drawing:

Fig. 1 is a diagrammatic illustration of on embodiment of the invention. I

Fig. 2 is a diagrammatic illustration of another form. l 4

Fig. 3 illustrates a third form.

As illustrated in Fig. 1, the compressor I has an air intake pipe 2 with a check-valve 3, and a discharge pipe 4 connected by a pipe 5 with a combustion chamber 6 to which fuel is supplied by a pipe I. A pipe 8 also is connected with the chamber 8 by the pipe 5, has a check'valve 9 and is the discharge pipe of an auxiliary fan I driven by an electric motor II. air is conducted from the combustion chamber 6 through a pipe I2 to the intake of an auxiliary turbine I3 which drives the compressor I by its shaft I3. The air passes from the discharge of the auxiliary turbine I3 through a pipe I4 to the intake of a motive turbine I from which it is discharged through a pipe IS. The motive turbine I5 drives a generator II by its shaft I5.

As illustrated in Fig. 2, the discharge pipe 8 of the auxiliary fan lii has two branches I8 and I9, the former I8 being connected with the intake pipe 2 of the compressor I between the check-valve 3 and the compressor I, and the latter l9 being connected with the pipe 5 leading to the combustion chamber 6. The branch i9 has a check-valve 20.

As illustrated in Fig. 3, the discharge pipe 4 of the compressor I is connected with the intake of a second'and smaller compressor 2i which is driven by a shaft I3" actuated by the auxiliary turbine I3 in any suitable manner, and having its discharge pipe 22 connected with the pipe 5 to the combustion chamber 6. In this form of the device, the pipe 8 has its branch I8 connected with the pipe 2 of the compressor I, as

shown in Fig. 2. The branch I8 has two branches 23 and 24, the former 23 being connected with the pipe 5 and having a check-valve 26.

In the form of the device illustrated in Fig. 1, the fan Ill driven by the motor II supplies air through pipes 8 and 5 to the combustion chamher 8 where it is heated and whence it passes The heated through pipe I! to the auxiliary turbine I8. The turbine l3, thus energized, drives the compressor I which sucks air through pipe 2, the check valve 8 opening, and discharges the air throughv pipe 4 to pipe 5 and the chamber 8. When the pressure of the compressor l exceeds the pressure of the fan III, the check valve 8 closes and the fan I0 is stopped.

In the form of the device illustrated in Fig. 2, the air from fan l0 passes through pipe 8 to its branches I8 and I9. Before the compressor I has been started, substantially all of this air passes through branch I9 to pipe 5 and combustion air from fan in passes through the compressor I,

the valve 8 preventing escape. When the fan I0 is stopped, cutting of! pressure in pipe I8, the check-valve 3 opens to allow the compressor I to suck in air through pipe 2.

In the form of the device illustrated in Fig. 3, the air from the fan I0 passes through pipe 8 to its branches I8 and I9, and the branches 23 and 24 of branch I9. Substantially all of this air passes through branch 24 to pipe 5 and chamber 6, as in the forms illustrated-in Figs. 1 and 2. The compressor 2|, being the smaller, starts to operate before the compressor I, and when pressure in pipe 22 exceeds pressure in branch 24, the valve 26 closes. When pressure from the compressor I through its pipe 4 exceeds pressure in branch 2-3, the valve 25 closes, and all the air from the fan I0 passes through branch I8 and the compressors I and 2|, valve 3 preventing escape. When fan I0 is stopped, the air is supplied to the compressors I and 2| through pipe 2, the valve 3 opening.

What is claimed is:

1. In a compressor device, the combination of an air compressor, a check valve mounted on the suction end of the compressor between the atmosphere and the compressor and opening towards the compressor when the latter sucks in a sufilcient quantity of air, an auxiliary fan, a first conduit connecting the delivery of the fan to the suction of the compressor between the check valve and the compressor, a second conduit connecting the delivery of the fan with the delivery of the compressor, a check' valve mounted in the second conduit and opening towards the delivery of the compressor and closing when the air pressure furnished by the compressor is greater than-that supplied by the fan, and a motor for driving the fan.

2. In a compressor device, the combination of two compressors mounted in series, a starting ran connected in series-parallel with each of the compressors, a check valve set on the compressor end sucking in atmospheric air, a check valve mounted on each one of the connections between the delivery end of the fan and the' delivery end of each one of the compressors, and a. motor for driving the fan.

LOUIS ARMAND rrmm'rm. 

